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Underwater superaerophobic Ni nanoparticle-decorated nickel–molybdenum nitride nanowire arrays for hydrogen evolution in neutral media
Nano Energy ( IF 17.6 ) Pub Date : 2020-09-12 , DOI: 10.1016/j.nanoen.2020.105375
Lu Shang , Yunxuan Zhao , Xiang-Yu Kong , Run Shi , Geoffrey I.N. Waterhouse , Liping Wen , Tierui Zhang

Electrochemical water splitting into hydrogen and oxygen in neutral electrolytes has great significance for future energy supply security, potentially offering a pathway for H2 generation from seawater. However, the electrocatalytic hydrogen evolution reaction (HER) generally occurs at low rates in neutral solutions due to the low proton concentration in such media. Herein, we fabricated a novel HER catalyst capable of efficient H2 evolution in water at neutral pH, comprising a nickel-molybdenum nitride nanowire array modified with metallic Ni nanoparticles (Ni/NiMoN). The entire Ni/NiMoN array was supported on a Cu foam. The Ni nanoparticles promoted the dissociation of adsorbed water to enhance the supply of protons in the neutral electrolyte, whilst the nanowire array imparted the electrode surface with underwater superaerophobic properties, thus allowing H2 gas bubbles to detach from the electrode in a facile manner. On the basis of the synergies realized between the different electrode components, the Ni/NiMoN nanowire array electrode offered exceptional HER performance, with an overpotential of only 37 mV at a current density of 10 mA cm−2 in a neutral electrolyte. Results guide the development of next-generation earth-abundant element electrocatalysts for HER in neutral media.



中文翻译:

水下超好氧镍纳米粒子修饰的镍-氮化钼纳米线阵列在中性介质中析氢

在中性电解质中分解为氢和氧的电化学水对未来的能源供应安全具有重要意义,可能为从海水中生成H 2提供途径。但是,由于这种介质中的质子浓度低,所以在中性溶液中电催化放氢反应(HER)通常以低速率发生。在这里,我们制造了一种新型的能够高效H 2的HER催化剂在中性pH值下的水演化过程,包括用金属Ni纳米粒子(Ni / NiMoN)修饰的镍钼氮化物纳米线阵列。整个Ni / NiMoN阵列被支撑在Cu泡沫上。Ni纳米粒子促进了吸附水的离解,从而增强了中性电解质中质子的供应,而纳米线阵列赋予了电极表面水下超疏水性,从而使H 2气泡以便捷的方式从电极上脱离。基于在不同电极组件之间实现的协同作用,Ni / NiMoN纳米线阵列电极提供了出色的HER性能,在电流密度为10 mA cm -2时只有37 mV的过电势在中性电解液中。结果指导了在中性介质中用于HER的下一代地球富集元素电催化剂的开发。

更新日期:2020-09-12
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